Autogenesis, also known as spontaneous generation, refers to the theory that living organisms can arise from non-living matter. However, there are several synonyms for this term, including abiogenesis, heterogenesis, and spontaneous generation. These words describe the same concept, but they are used in different contexts. Generally, these terms are used in biology and microbiology to describe the origin of life on Earth. The study of autogenesis has been a topic of scientific inquiry since the time of the ancient Greeks. While the theory of spontaneous generation has been largely discredited, the search for the origin of life continues to be a central question in biology.